ὑπονομή
From LSJ
ἀκίνδυνοι δ' ἀρεταὶ οὔτε παρ' ἀνδράσιν οὔτ' ἐν ναυσὶ κοίλαις τίμιαι → but excellence without danger is honored neither among men nor in hollow ships
English (LSJ)
ἡ,
A underground passage, mine, Str.13.1.67, D.S.20.94. II metaph., in pl., secret stratagems or intrigues, Hsch. III burrowing of rabbits, Str.3.5.2.